<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root"></div>
    <script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    <script type="text/babel">
        class H1Element extends React.Component{
            render(){
                return <h1 title={this.props.myTitle}>{this.props.children}</h1>
            }
        }
        class PElement extends React.Component{
            render(){
                let content = "段落1";
                let className = "p1";
                return <div>
                    {/* 注释 */}
                    <label htmlFor="d1">内容</label>
                    <p id="d1" className={className}>{content}</p>
                </div>
            }
        }
        class RootElement extends React.Component{
            
            render(){
                let ary = new Array(50).fill(0);
                return <div>
                    <H1Element myTitle="标题1">标题内容</H1Element>
                    {ary.map(() => <PElement></PElement>)}
                </div>
            }
        }
        ReactDOM.render(<RootElement />,document.getElementById("root"));
    </script>
</body>
</html>